Finding the Center of Mass for a Pinewood Derby Car

AI Thread Summary
To determine the center of mass of a pinewood derby car, one effective method is to balance the finished car on a knife edge or hang it from a string at multiple points to find the intersection of the lines that pass through the center of mass. Calculating the center of gravity (CoG) for each component and summing them can also be useful. It is recommended to place weight as low and as far back on the car as possible to enhance performance. Additionally, minimizing wheel friction through proper lubrication is crucial, followed by considerations of weight distribution and aerodynamics. Overall, achieving an optimal design involves balancing these factors for the best racing outcome.
bart Sherer
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I am trying to determine the center of mass of a pinewood derby car. Any suggestions on how this can be done?
 
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On paper, my measuring the shape and mass of each component - calculating their individual CofG then calculating the overall value.
Or just balance the finished car on a knife edge.
 
Thanks. There is also a lot of discussion as to where the weight in the car shoud be placed. I assume the weight should be placed as low as possible and as far back on the vehicle as possible. Your input is appreciated.
 
Hang the car from the middle of a string, the hanging (free) end of the string will pass through the cm. Do this from 2 different points, the intersection is your cm.
 
To find the center of mass, you actually need *3* different 'hangings' because the car is 3-dimensional. Two will identify the line that passes through the center of mass, the third will reduce it to a point.

In any case, IIRC, the number 1 design consideration is the wheel friction. The wheels must spin freely and be lubricated. Then, the weight and aerodynamics come into play.
 

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